In last-ditch desperation I tried this, even though I was pretty sure it was bunk.
And it was.
My poor husband had to drive all the way from North Ruralville to Richardson to unlock my van.
I haven't done that in years.
He was gracious about it, however, saying that once when he was driving around doing rural insurance inspections, he locked his keys in the car twice in one week. I still felt schmucky, though.